There's been some discussion and speculation on the 70D being a merger of the xxD line and the 7D, but the scuttlebutt appears to be an end of the xxD line as well ast the 7D, creating one new line (6D) by retiring the other two.

From a business PoV this does make some sense. It doesn't make sense of the 6D is of "lower build quality" (which I've seen mentioned and likely parroted by other sites by now) then the 7D.

None of this really makes sense. Why would Canon merge the xxD line and the 7D when the 7D line was a separation of the xxD line (50D split off into a lower end 60D and higher end 7D)?

Also consider that if they kill off the xxD line they will have xxxD and xD remaining with no middle ground.

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